A.Traties is the answer probably.I had some hard thinking and came up with this.
I know this does not help but put ur mind into it and trust me u will succeed.
Answer:
By 1860, 30,000 miles (49,000 km) of railroad tracks had been laid,.
By 1860, 30,000 miles (49,000 km) of railroad tracks had been laid, with 21,300 miles (34,000 km) concentrated in the northeast.
According to Freud's psychoanalytic theory, all psychic energy is generated by libido. Freud suggested that our mental states were influenced by two competing forces: cathexis and anticathexis. Cathexis was described as an investment of mental energy in a person, idea, or object.